rule win_lechiket_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.lechiket."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.lechiket"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { 85c0 7d0a 56 e8???????? }
            // n = 4, score = 100
            //   85c0                 | test                eax, eax
            //   7d0a                 | jge                 0xc
            //   56                   | push                esi
            //   e8????????           |                     

        $sequence_1 = { 8b0b 85c9 5b 7406 ff15???????? }
            // n = 5, score = 100
            //   8b0b                 | mov                 ecx, dword ptr [ebx]
            //   85c9                 | test                ecx, ecx
            //   5b                   | pop                 ebx
            //   7406                 | je                  8
            //   ff15????????         |                     

        $sequence_2 = { 56 8945dc 8d45ec 50 8d45d4 50 68000010c0 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   8945dc               | mov                 dword ptr [ebp - 0x24], eax
            //   8d45ec               | lea                 eax, [ebp - 0x14]
            //   50                   | push                eax
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   50                   | push                eax
            //   68000010c0           | push                0xc0100000

        $sequence_3 = { 57 bf40420f00 57 6a01 ff15???????? 8b7508 }
            // n = 6, score = 100
            //   57                   | push                edi
            //   bf40420f00           | mov                 edi, 0xf4240
            //   57                   | push                edi
            //   6a01                 | push                1
            //   ff15????????         |                     
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]

        $sequence_4 = { 56 ff7508 8d8548ffffff 68???????? 50 }
            // n = 5, score = 100
            //   56                   | push                esi
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8d8548ffffff         | lea                 eax, [ebp - 0xb8]
            //   68????????           |                     
            //   50                   | push                eax

        $sequence_5 = { be04220000 56 6a01 ff15???????? 56 }
            // n = 5, score = 100
            //   be04220000           | mov                 esi, 0x2204
            //   56                   | push                esi
            //   6a01                 | push                1
            //   ff15????????         |                     
            //   56                   | push                esi

        $sequence_6 = { 68ffff1f00 8d45fc 50 c7458818000000 }
            // n = 4, score = 100
            //   68ffff1f00           | push                0x1fffff
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   c7458818000000       | mov                 dword ptr [ebp - 0x78], 0x18

        $sequence_7 = { 59 8d7db8 f3ab 8d7dd0 ab ab ab }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   8d7db8               | lea                 edi, [ebp - 0x48]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8d7dd0               | lea                 edi, [ebp - 0x30]
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   ab                   | stosd               dword ptr es:[edi], eax

        $sequence_8 = { 7509 56 ff15???????? ebd5 }
            // n = 4, score = 100
            //   7509                 | jne                 0xb
            //   56                   | push                esi
            //   ff15????????         |                     
            //   ebd5                 | jmp                 0xffffffd7

        $sequence_9 = { 7535 68???????? 53 53 53 57 }
            // n = 6, score = 100
            //   7535                 | jne                 0x37
            //   68????????           |                     
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   57                   | push                edi

    condition:
        7 of them and filesize < 331776
}